Li W H, Gouy M, Sharp P M, O'hUigin C, Yang Y W
Center for Demographic and Population Genetics, University of Texas, Houston 77225.
Proc Natl Acad Sci U S A. 1990 Sep;87(17):6703-7. doi: 10.1073/pnas.87.17.6703.
Phylogenetic analysis of DNA sequences from primates, rodents, lagomorphs, artiodactyls, carnivores, and birds strongly suggests that the order Rodentia is an outgroup to the other four mammalian orders and that Artiodactyla and Carnivora belong to a superordinal clade. Further, there is strong evidence against the Glires concept, which unites Lagomorpha and Rodentia. The radiation among Lagomorpha, Primates, and Artiodactyla--Carnivora is very bush-like, but there is some evidence that Lagomorpha has branched off first. Thus, the branching sequence for these five orders of mammals seems to be Rodentia, Lagomorpha, Primates, Artiodactyla, and Carnivora. The branching date for Rodentia could be as early as 100 million years ago. The rate of nucleotide substitution in the rodent lineage is shown to be at least 1.5 times higher than those in the other four mammalian lineages.
对灵长目动物、啮齿动物、兔形目动物、偶蹄目动物、食肉动物和鸟类的DNA序列进行系统发育分析,结果有力地表明,啮齿目是其他四个哺乳动物目的外类群,偶蹄目和食肉目属于一个超目分支。此外,有强有力的证据反对将兔形目和啮齿目归为一类的“啮齿动物-兔形目动物”概念。兔形目、灵长目以及偶蹄目-食肉目之间的分化关系非常复杂,但有证据表明兔形目最先分化出来。因此,这五个哺乳动物目的分支顺序似乎是啮齿目、兔形目、灵长目、偶蹄目和食肉目。啮齿目的分支时间可能早至1亿年前。啮齿动物谱系中的核苷酸替换率至少是其他四个哺乳动物谱系的1.5倍。